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采用激光沉积修复技术对GH4169镍基高温合金贯通槽式损伤工件进行修复,分析了修复过程中气孔及熔合不良等缺陷的产生原因,通过优化工艺参数,获得了无缺陷的修复件;考察了修复件的微观组织及力学性能,并对修复件进行了局部热处理。结果表明:优化工艺参数后得到的修复区和基体形成了致密的冶金结合,采用局部热处理可明显提升修复件的抗拉强度。
The laser deposition repair technology was used to repair the GH4169 nickel-based superalloy through groove trenches. The causes of defects such as porosity and fusoriness during the repairing process were analyzed. The defect-free repairs were obtained by optimizing the process parameters. Pieces of the microstructure and mechanical properties, and the restoration of a partial heat treatment. The results show that a compact metallurgical bond is formed between the repaired area and the substrate after optimization of the process parameters. The local heat treatment can obviously improve the tensile strength of the repaired parts.